Thermometer



'E. .BANDOLY v THERMOMETER April 21, 1936.

Filed June 13, 1955 1 2 7 INVENTOR E3101; BANIDOLY.

ATTORNEY Patented Apr. 21, 1936 UNITED STATES PATENT OFFICE THERMOMETERErich Bandoly. Rochester, N. Y., assignor to Taylor InstrumentCompanies, Rochester, N. Y., a corporation of New York Application June13, 1935, SerialNo. 26,319

3 Claims. (01. 73 11s) This invention relates to thermometers and moreparticularly to thermometers employing bimetallic thermosensitiveelements.

The present invention has for its purpose the production of athermometer of the above-mentioned type which is simple in constructionand which can be assembled and calibrated at low cost while stillproviding an instrument that is reliable in operation.

The various features and advantages of the present invention will appearfrom the detailed description and claims when taken with the drawing inwhich Fig. 1 is a front View of the present thermometer with a portionof the bezel, crystal, dial and index broken away; Fig. 2 is a sectionthrough the thermometer of Fig. 1 taken substantially on the line 2-2 ofthat figure; Fig. 3 is a cross-section taken on the line 3-3 of Fig. 1;Figs. 4 and 5 are detail views showing the method of attaching asupporting bracket to the thermometer; Figs. 6, 7 and 8 show differentviews of a slightly differently shaped bracket, attached to thethermometer, by which it can be hung from a. rod.

Referring especially to Figs. 1, 2 and 3 of the drawing, 5 generallydesignates a case for the thermometer which case includes a flatcircular back provided with an integral ring 6 extending at right anglesthereto. This ring is provided with an integral dial support I ofoctagonal outline extending in a plane parallel to the back of the case5 which support is formed with a right angular flange or rim 8. The caseis preferably made from a single sheet stamping, although it can be madeof die-cast or other molded material. The back of the case 5 is providedwith an outwardly offset circular portion 9 with an opening i0 thereinthe offset portion having a pair of opposing ears I I struck therefromand extending toward said opening within the case. The offset portion isadapted to receive a disc l2 provided with an integral bracket [3 offsetfrom the disc, on which bracket there is mounted a bimetallic coilspring I4. The specific mounting of the coil spring 14 includes a rightangular arm l5 integral with the bracket, a portion l6 of this arm beingdoubled back on itself to retain the end of the spring i4 therebetween.The inner end of the coil spring is received in a kerf or slot in oneend of an arbor I! with the portions of the arbor at the slot pressedtoward each other to grip the mentioned end of the coil spring. The freeend of the arbor ll extends through an opening l8 in a dial l9 whichrests on the support I and which is provided with suitable graduations 4after riveted on the free end of the arbor.

over which the index 20, carried by the free end of the arbor ll,swings. A ring 2| has one edge engaging the margin of the dial, whilethe other edge thereof supports a crystal 22 which is held against thering by an octagonal bezel 23 frictionally engaging the rim 8 of thecase.

In assembling the thermometer, the inner end of the bimetallic coilspring I4 is inserted in the slot in the arbor I! and the material atthis end of the arbor is forced together to grip the mentioned end ofthe spring. The outer end of the bimetallic spring is inserted betweenthe arms [5 and I6 of the bracket l3, which parts are forced together togrip that end of the spring. The disc l2, integral with the bracket I3,is then inserted under the ears II, with its rear surface in engagementwith the inner surface of the offset portion 9 of the back. The ears Hare thereupon forced toward the plane of the offset portion so that theyfrictionally engage this disc to retain it in the position to which ithas been adjusted. The dial [9 is then placed on the support I of thecase with the arbor ll extending through the dial opening I8 and theindex 20 is there- The ring 2| is then placed on the dial plate in theposition illustrated, after which the crystal 22 is positioned on thisring and the bezel 23 is forced over the rim 8 of the case.

For convenience in calibrating the thermometer, the disc I2 is providedwith a pair of spaced recesses 24 accessible through the opening II] inthe case, which recesses are engageable by a spanner wrench so that thedisc and the parts carried thereby, including the index 20, can berotated to move the index into desired relation to the graduations onthe dial.

In a thermometer of this type it is desirable that it be provided withan inexpensive supporting bracket 25 mounted on the back of thethermometer, as shown especially in Figs. 2, 4, 5, 6, '7 and 8. Thisbracket is provided with a longitudinal slot 26 toreceive the shank of arivet 21 which after insertion through an opening on the back of thecase is peened over against the inner surface of the back. It should benoted that the portion 29 of the bracket is made into concave form (Fig.5) so that when the rivet is forced into this concave portion of thebracket the thermometer will be held frictionally against rotation onthe bracket. The other end 39 of the bracket is provided with screwholes 3| by which it may be attached to a window frame or the like. Thebracket shown in Figs. 6, 7 and 8 is the same as that illustrated inFigs. 2, 4 and 5, except that it is provided at its free end with a hook32 by which the thermometer may be supported from a rod or bar such asin a refrigerator or in an oven.

I claim:

1. In a thermometer, a case having a back, a bracket provided with adisc having one of its surfacesengaging a face of said back, ears struckup from said back to engage the other surface of said disc, a bimetallicelement having one end attached to said bracket, an index carried by theother end of said element and a graduated scale carried by said case inoperative relation to said index.

2. In a thermometer, a case having a back pro vided with an outwardlydepressed circular portion, a bracket provided with a circular disc withone of its surfaces engaging the face of the depressed portion of theback, ears struck up from said back to engage the other side of saiddisc,

a bimetallic element having one end attached to said bracket, an indexcarried by the other end of said element, and a dial mounted on saidcase in operative relation to said index.

3. In a thermometer, a case having a back provided with an outwardlydepressed circular portion, said portion having an aperture therein, abracket provided with a circular disc having one of its surfacesengaging the inner surface of the depressed portion of said back, earsstruck up from said back to engage the other side of said disc, abimetallic element having one end attached to said bracket, an indexcarried by the other end of said spring, a dial carried by said case inoperative relation to said index, and means on said disc accessiblethrough said aperture for efiecting rotation of the disc and the partscarried thereby.

ERICH BANDOLY.

